Severe Fear of Throwing Up: Need Tips for Endoscopy Tomorrow

I have a severe fear of throwing up and I keep on worrying about it and I keep feeling nauseous because of the anxiety, I have to get an endoscopy done tomorrow and I can’t stop panicking and it’s too late to cancel it. I try talking to people about it but they just don’t seem to understand that the procedure isn’t really what I’m afraid of, I’m afraid of what will happen when it’s done, will I throw up when I wake up? Will I be okay once I get out? Will they be able to give me medication for the nausea? What if they can’t do anything? What if I wake up anxious and then throw up because of it? I can’t stop overthinking everything and everyone thinks i’m overreacting. Any tips??